1. Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, USA
2. Department of Periodontology, Graduated School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
3. Division of Regenerative and Reconstructive Sciences, UCLA School of Dentistry, Los Angeles, USA
4. Department of Dentistry, College of Medicine, Hanyang University, Seoul, Korea